Ground Floor - Suspended floors – Concrete and Beam & Block
 
When used for thermal insulation Rockfloor may be placed under:

. flooring grade T & G chipboard, OSB, plywood etc. and supported on suspended beam and block floors

. screeds laid in accordance with BS 8204: Part 1, and supported on leveled
suspended beam and block floors
 
The Rockfloor boards are laid lengthways to the longest wall, in a staggered joint pattern, tissue face upwards. The off cut at one end of the first row is then used to start the next row and similarly with subsequent rows.
 
Chipboard
When chipboard is used a VCL is placed under the Rockfloor or the chipboard.

Starting from one corner of the room, lay the boards lengthwise parallel to the longest wall with the gap maintained against the adjacent walls. The boards are laid with staggered joints working towards the opposite corner of the room. All tongue and groove joints must be glued with PVA adhesive and tightly engaged. The final boards must be cut in order to maintain the appropriate gap against the wall and to allow the tongue and groove joints to be engaged.
 
Edge detail
To allow for expansion of the chipboard a minimum 10mm wide gap should be provided around the room perimeter. This gap should be packed with self-adhesive neoprene isolating strips. Where acoustic insulation is required, a gap of approximately 5 mm should be left between the chipboard and the bottom edge of the skirting.
 
Thresholds
At thresholds, stair landings, or where a change in floor construction occurs, the insulation should be cut back and a timber batten of the same thickness as the insulation inserted to reinforce the edge. Where acoustic insulation is required, the batten thickness should be reduced to include a 6 mm thick neoprene isolation strip bonded to the batten.